The '''​ECOMS UDG''' provides access to a reduced  number of variables for the [http://meteo.unican.es/trac/wiki/udg/ecoms/dataserver/datasets available datasets]. The following list of variables has been identified (and is periodically updated) according to the user's needs, receiving feedback from EUPORIAS WP22 (climate information indices, CIIs), WP23 (impact models), WP21 (calibration and downscaling) and SPECS WP61 (pilot applications) and WP52 (calibration and downscaling). See  the section on the [wiki:../../EndUserNeeds assessment of user's needs] for more details.

Note that the '''R names''' below correspond to the vocabulary names used in the [wiki:RPackage R data access package], which may not correspond to the different vocabularies of each particular dataset. These names have been used for homogenization purposes to build the [wiki:RPackage/homogeneization vocabulary] of the R package for data access. Note that, '''data homogenization and aggregation (i.e. daily means from 6h data) is only provided through the R data access package.''' 

In order to specify the particular '''temporal frequency/aggregation''' available for the variables in the different datasets, the following codes are used in the table below: '''6h''' (6-hourly instantaneous data). '''12h''' (12-hourly instantaneous data). '''24h''' (24-hourly instantaneous data). '''DM''' (daily mean value). '''DX''' (daily maximum value). '''DN''' (daily minimum value).  '''DA''' (daily accumulated data). '''DAr''' (accumulated since the initialization time –`runtime`) NOTE: The R package performs deaccumulation on a daily basis to match the standard definition. '''fx''' (static field)

In the table below, boldface codes (e.g. '''6h''') indicate variables already available through the ECOMS UDG. '''Italics''' are used for work in progress (variables to be included in the next update). '''e''' indicates that a variable exists in the original dataset but it is not planned to be included yet in ECOMS-UDG; '''blanks''' indicate that the variables do not exist in the original dataset. Codes ended by '''(*)''' indicate variables which do NOT exist in the dataset, but are derived/approximated from other available ones through the [wiki:RPackage R  data access package] .  More information on the particular approximations used are given in the [http://meteo.unican.es/trac/wiki/EcomsUdg/EndUserNeeds/ListOfVariables variables-datasets mapping]. Variables ended by '''(#)''' indicate daily aggregated values obtained from the corresponding original 3-hourly data. 



|| || ||  '''Observations:'''   ||||  '''Reanalysis:'''  ||||||||||  '''Seasonal forecasting models:'''  ||
||  '''R name'''  ||  '''Variable description'''   ||  '''[http://meteo.unican.es/tds5/catalogs/wfdei/wfdeiDatasets.html?dataset=wfdei/wfdei_daily.ncml WFDEI]'''  ||  '''[http://meteo.unican.es/tds5/catalogs/ncepReanalysis1/ncepReanalysis1Datasets.html?dataset=ncepReanalysis1/ncepReanalysis1_4xDaily.ncml NCEP_ reanalysis1]'''   ||  '''[http://meteo.unican.es/tds5/catalogs/value.html?dataset=interim/daily/interim20_daily.ncml ERA_ Interim]''' ||   '''[http://www.meteo.unican.es/tds5/catalogs/system4/System4Datasets.html?dataset=system4/System4_Seasonal_15Members.ncml System4_ seasonal_15]'''  ||  '''[http://www.meteo.unican.es/tds5/catalogs/system4/System4Datasets.html?dataset=system4/System4_Seasonal_51Members.ncml System4_ seasonal_51]'''  ||  '''[http://www.meteo.unican.es/tds5/catalogs/system4/System4Datasets.html?dataset=system4/System4_Annual_15Members.ncml System4_ annual_15]'''  ||  '''[http://www.meteo.unican.es/tds5/catalog/cfs/agg/catalog.html?dataset=cfs/agg/cfsAgg_fmrc.ncd CFSv2_ seasonal_15]'''  ||'''[http://www.specs-fp7.eu/wiki/index.php/Data SPECS_ESGF]'''  ||
||||||||||||||||||  ''__Surface variables__''  ||
||tas||Near-Surface air temperature||  '''DM'''  ||  '''6h'''  ||  '''6h/DM'''  ||  '''DM'''  || ||  e  ||  e  ||
||tasmax||Daily Maximum Near-Surface Air Temperature||  '''DX(#)'''  ||  '''6h'''  ||  '''DX'''  ||  '''DX'''  ||  '''DX'''  ||  '''DX'''  ||  e  ||
||tasmin||Daily Minimum Near-Surface Air Temperature||  '''DN(#)'''  ||  '''6h'''  ||  '''DN'''  ||  '''DN'''  ||  '''DN'''  ||  '''DN'''  ||  e  ||
||tp||Total precipitation amount||  '''DA'''  ||  '''6hA'''  ||  '''DAr'''  ||  '''DAr'''  ||  '''DAr'''  ||  '''DA'''  ||  e  ||
||psl||Sea Level Pressure||    ||  '''6h'''  ||  '''6h'''  ||  '''6h'''  ||  '''12h'''  ||  '''6h'''  ||  e  ||
||ps||Surface air pressure||  '''DM'''  ||   ||  '''6h(*)'''  ||  || ||  e  || ||
||wss||Wind speed (at 10m)||  '''DM'''  ||   ||  '''6h(*)'''  ||  e  ||  e  ||  '''6h(*)'''  || ||
||tdps||2m Dewpoint Temperature ||    ||    ||  '''6h'''  ||  e  || || ||  e  ||
||huss||Surface (2m) specific humidity ||  '''DM'''  ||  '''6h'''  ||  '''6h(*)'''  || || ||  e  || ||
||rsds||Surface Downwelling Shortwave Radiation||  '''DA'''  ||  '''6hA'''  ||  '''DAr'''  ||  e  || ||  e  ||  e  ||
||rlds||Net Longwave Surface Radiation||  '''DA'''  ||  '''6hA'''  ||  '''DAr'''  ||  e  || ||  e  ||  e  ||
||sst||Sea surface temperature||    ||   ||  e   ||  e  ||  e  || || ||
||uas||Eastward Near-Surface Wind ||    ||  '''6h'''  ||  '''6h'''  ||  e  ||  e  ||  '''6h'''  ||  e  ||
||vas||Northward Near-Surface Wind ||    ||  '''6h'''  ||  '''6h'''  ||  e  ||  e  ||  '''6h'''  ||  e  ||
||wssmax||Wind speed (at 10m) ||    ||    ||  e  ||  e  ||  e  ||  e  || ||
||wgust||Wind gust ||    ||   ||  e  ||  e  || || || ||
||mrso||Total Soil Moisture Content ||    ||   || || || ||  e  ||  e  ||
||mrros||Surface runoff flux||    ||   ||  e  ||  e  || ||  e  || ||
||mrro||Total Runoff ||    ||   ||  e  ||  e  || || ||  e  ||
||ssro||Sub-surface runoff rate||    ||    ||  e  ||  e  || || || ||
||wcsl||Water Content of Soil Layer ||    ||    ||  e  ||  e  || || || ||
||prsn||Snowfall amount ||  '''DA'''  ||    ||  e  ||  e  || || ||  e  ||
||sd||Snow Depth||    ||    ||  '''24h'''  ||  e  || ||  e  || ||
||||||||||||||||||  ''__3D vars @ isobaric surface levels__''  ||
||ua||Eastward Wind ||    ||  '''6h @ standard levels'''  ||  '''12h @ standard levels'''  ||  e  ||  e  ||  e  || ||
||va||Northward Wind ||    ||  '''6h @ standard levels'''  ||   '''12h @ standard levels'''  ||  e  ||  e  ||  e  || ||
||z||Geopotential height ||    ||  '''6h @ standard levels'''  ||   '''12h @ standard levels'''  ||  e  ||  e  ||  e  || ||
||ta||Air temperature||    ||  '''6h @ standard levels'''  ||  '''12h @ standard levels'''  ||  e  ||  e  ||  e  || ||
||hus||Specific humidity ||    ||  '''6h @ standard levels'''  ||  '''12h @ standard levels'''  ||  e  ||  e  ||  e  || ||
||||||||||||||||||  ''__Static fields__''  ||
||zs||Surface geopotential height||    ||    ||  '''fx'''  ||  e  || ||  e  || ||
'''@ standard Levels: 1000,850,700,500,300,200 mb, except for hus, which is not available at 200mb'''


'''Data Homogeneization:''' The different nature of the datasets, and the idiosyncratic naming and storage conventions often applied by the modelling centres, makes necessary an homogenization across datasets in order to implement a truly user-friendly toolbox for data access.  To this aim, the [wiki:RPackage R package for data access] has been developed. Data homogenization is achieved through the creation of a common vocabulary. The particular variables of each dataset are then translated -and transformed if necessary- into the common vocabulary by means of a ''dictionary''. Both features -vocabulary and dictionary- are described [wiki:RPackage/homogeneization here]. In particular, some typical transformations performed by the `loadECOMS` interface are deaccumulation of initialization-accumulated variables to daily accumulated (i.e.: '''DAr''' --> '''DA''') and scaling and/or offset of variables to match standard units (e.g. -273.15 for conversion K --> ºC).